Hi. I'm fairly new to fishkeeping and currently only have one tank. It's a 28 gallon bowfront and has six inhabitants 1 pictus cat, 3 scissor tail rasbora, many nitrite snails, 1 hatchetfish a freshwater mussle and 2 zebra danios( the rest were eaten by the pictus) anyway Is their room for any other tankmates or is this it?